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The library enhancing Java classes at compilation by annotations that contained in the Develhack Core Library.
There is a newer version: 0.1.5
/*
 * Copyright (C) 2012 The Project Lombok Authors.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package lombok.eclipse.agent;

import static org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants.AccStatic;

import java.util.Arrays;

import org.eclipse.jdt.core.CompletionProposal;
import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.internal.codeassist.CompletionEngine;
import org.eclipse.jdt.internal.codeassist.InternalCompletionProposal;
import org.eclipse.jdt.internal.codeassist.complete.CompletionOnMemberAccess;
import org.eclipse.jdt.internal.codeassist.complete.CompletionOnQualifiedNameReference;
import org.eclipse.jdt.internal.codeassist.complete.CompletionOnSingleNameReference;
import org.eclipse.jdt.internal.compiler.ast.ASTNode;
import org.eclipse.jdt.internal.compiler.lookup.MethodBinding;
import org.eclipse.jdt.internal.compiler.lookup.TypeBinding;

public class ExtensionMethodCompletionProposal extends InternalCompletionProposal {
	public ExtensionMethodCompletionProposal(final int replacementOffset) {
		super(CompletionProposal.METHOD_REF, replacementOffset - 1);
	}
	
	public void setMethodBinding(final MethodBinding method, final ASTNode node) {
		MethodBinding original = method.original();
		TypeBinding[] parameters = Arrays.copyOf(method.parameters, method.parameters.length);
		method.parameters = Arrays.copyOfRange(method.parameters, 1, method.parameters.length);
		TypeBinding[] originalParameters = null;
		if (original != method) {
			originalParameters = Arrays.copyOf(method.original().parameters, method.original().parameters.length);
			method.original().parameters = Arrays.copyOfRange(method.original().parameters, 1, method.original().parameters.length);
		}
		
		int length = method.parameters == null ? 0 : method.parameters.length;
		char[][] parameterPackageNames = new char[length][];
		char[][] parameterTypeNames = new char[length][];

		for (int i = 0; i < length; i++) {
			TypeBinding type = method.original().parameters[i];
			parameterPackageNames[i] = type.qualifiedPackageName();
			parameterTypeNames[i] = type.qualifiedSourceName();
		}
		char[] completion = CharOperation.concat(method.selector, new char[] { '(', ')' });
		setDeclarationSignature(CompletionEngine.getSignature(method.declaringClass));
		setSignature(CompletionEngine.getSignature(method));

		if (original != method) {
			setOriginalSignature(CompletionEngine.getSignature(original));
		}
		setDeclarationPackageName(method.declaringClass.qualifiedPackageName());
		setDeclarationTypeName(method.declaringClass.qualifiedSourceName());
		setParameterPackageNames(parameterPackageNames);
		setParameterTypeNames(parameterTypeNames);
		setPackageName(method.returnType.qualifiedPackageName());
		setTypeName(method.returnType.qualifiedSourceName());
		setName(method.selector);
		setCompletion(completion);
		setFlags(method.modifiers & (~AccStatic));
		int index = node.sourceEnd + 1;
		if (node instanceof CompletionOnQualifiedNameReference) {
			index -= ((CompletionOnQualifiedNameReference) node).completionIdentifier.length;
		}
		if (node instanceof CompletionOnMemberAccess) {
			index -= ((CompletionOnMemberAccess) node).token.length;
		}
		if (node instanceof CompletionOnSingleNameReference) {
			index -= ((CompletionOnSingleNameReference) node).token.length;
		}
		setReplaceRange(index, index);
		setTokenRange(index, index);

		setRelevance(100);

		method.parameters = parameters;
		if (original != method) {
			method.original().parameters = originalParameters;
		}
	}
}